Ko's is a term commonly associated with boxing and martial arts. It refers to a knockout, where a fighter is unable to continue the fight due to being knocked out by their opponent. Ko's can also be referred to as a knockout punch. Synonyms for ko's include knock out, K.O., sleeping, unconscious, and out cold. Other terms used to describe knockouts in combat sports include TKO, technical knockout, and DQ, disqualification. It is important to note that while knockouts can be exciting moments in a fight, it is crucial for fighters' safety to be the top priority and that they are properly trained and wear appropriate protective gear.